Just went for my first test drive after installing my Hydratech Level III Hydroboost. I hoped my braking would improve somewhat, really did not get my hopes way up, I just wanted some good braking. What I just experienced is beyond my wildest expectations. I have a manual proportioning valve in the cab for the rear brakes, I had it set in the middle, tire pressure on all four is 18psi, at 55mph, I locked the front up. Opened the prop valve fully open, tried it again at 60mph, this time all wheels locked up, what was not tied down went flying, including my full cup of tea. This mod although expensive, is totally worth it. I can not believe this system can work so well. I will be installing 39.5 Boggers next month, and have no doubt I will be able lock them up also. I have front and rear line locks. Those are the gold colored cylinders mounted on the inner fender. This pic you can see how I ran the lines to the proportioning valve through the firewall. Getting rid of the old vacuum booster was a added bonus to the hydroboost.